You can get seriously ill & even died if you also have underlying chronic illness like the followings:
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Diabetes - can become unstable.
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Chronic Airways Disease - can be exarcerbated requiring extra dosages of regular medications. Most will have secondary bacterial infections requiring antibiotics. Some will also get pneumonia.
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Chronic Heart Problems - all can worsens & become more symptomatics.
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Immunosuppressed patients - from those taking steroids for chronic asthma, arthritis etc , to those on supressants for organ transplants; HIV patients. All will be at risk for overwhelming secondary infections. Your Specialists may advise hospitalisation for closer monitoring.
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The very youngs & the very elderlies. They are not ill but are very susceptible to complications.
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Pregnancy